Maintenance collateral ratio (MCR): A ratio defined by the witnesses as minimum required collateral ratio.Maximum short squeeze ratio (MSQR): A ratio defined by the witnesses as to how far shorts are protected against short squeezes.Short squeeze protection (SQP): Defines the most a margin position will ever be forced to pay to cover settlement.

I don't know much about USDT . But I can see it is similar to BTC, so address is valid on bitcoin blockchain. You can check this on Blockchain.info - type your USDT address in search box. Good news is (at least that google said) your USDT keys will work on BTC blockchain, but I don't know how to import.

develop a way to peg fees to usd and a smartcontract that could check the peg every 24hours or so and amend the fees accordingly.

I won't go through the hassle and re-allocate the fees every time there is a pump or dump.

Why on chain? Could be done much easier. Just set witness pay in $ and announce it. Vote new fees based on that constant every new month 1st. This way you don't have to back to this discussion every market cap change. Is this much work?

1. Backup hold your keys, so it's allways the same as long as you don't change them - I'm far from being an expert here. Anyway, your old backup will work.2. Brainkey is the seed (literally). Your keys were generated from that phrase. That phrase is enough to bring back your account if your backup or password is lost.